Two independently segregating genes determine kernel color in wheat. Red color r

Question

Two independently segregating genes determine kernel color in wheat. Red color results from at least one dominant allele in both genes. Kernels on rrbb plants are white, and the lack of a dominant allele in either the R locus or the B locus (but not both) results in brown kernel color. if you mate a plant that is true-breeding for red color kernels with a plant that is true-breeding for white color kernels:

a. What is the expected phenotype of the F1 plants?

b. What are the expected phenotypic classes in the F2 progeny and their relative proportions?

Explanation / Answer

Answer:

Red: R_B_

White: rrbb

Brown: rrB_ or R_bb

Red (RRBB) x White (rrbb)---Parents

          RB                   rb --------Gametes

                RrBb (red)-----------F1

RrBb x RrBb -----Selfcross

RB

Rb

rB

rb

RB

RRBB (red)

RRBb (red)

RrBB (red)

RrBb (red)

Rb

RRBb (red)

RRbb(brown)

RrBb (red)

Rrbb(brown)

rB

RrBB (red)

RrBb (red)

rrBB (brown)

rrBb (brown)

rb

RrBb (red)

Rrbb(brown)

rrBb (brown)

rrbb (white)

Red = 9/16

Brwon = 6/16

White = 1/16

RB

Rb

rB

rb

RB

RRBB (red)

RRBb (red)

RrBB (red)

RrBb (red)

Rb

RRBb (red)

RRbb(brown)

RrBb (red)

Rrbb(brown)

rB

RrBB (red)

RrBb (red)

rrBB (brown)

rrBb (brown)

rb

RrBb (red)

Rrbb(brown)

rrBb (brown)

rrbb (white)

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